Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus
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Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus. Yuk L. Yung M. C. Liang, California Institute of Technology yly@gps.caltech.edu EGU Meeting 2008. Important Processes in the Atmosphere of Venus. Catalytic Chemical Cycles Heterogeneous Chemistry

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Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus

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Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus

Yuk L. Yung

M. C. Liang,

California Institute of Technology

yly@gps.caltech.edu

EGU Meeting

2008


Important Processes in the Atmosphere of Venus

  • Catalytic Chemical Cycles

  • Heterogeneous Chemistry

  • Middle Atmosphere Circulation

  • OCS as tracers of chemistry and dynamics


Venus model description

  • Two-dimensional Caltech/JPL KINETICS chemical transport model

  • Solve continuity equation for 24 species with ~200 chemical reactions (subset of Mills’)


Role of circulation

  • Affect the upward flux of OCS from the surface

  • Reduce OCS abundances at high latitudes


S

hv

S2

S

S3

OCS

S4

CO

hv

hv

S

hv

hv

S2

S3

hv

S4

S8

S4

S


Conclusions

  • Scale height of OCS cannot be explained by photolysis alone

  • Photosensitized dissociation of OCS via polysulfur photochemistry

  • Integrated destruction rate of OCS is 23,000 Tg- S/yr [Earth = 10 Tg-S/yr]


Acknowledgements

  • NASA and ESA

  • P. Drossart

  • R. L. Shia

  • K. Baines

  • D. Crisp

  • C. Lee

  • X. Jiang

  • B. Bezard

  • E. Marq


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